On June 22nd, 2021, researchers discovered new details about the SonicWall vulnerability which was disclosed in October of last year was only partially fixed. The vulnerability, a critical stack-based Buffer Overflow, tracked as CVE-2020-5135, was known to impact over 800,000 SonicWall VPNs. Once exploited the vulnerability would allow unauthenticated remote attackers to execute arbitrary code on the impacted device.
Unfortunately, it has been determined the vulnerability was not properly patched. This vulnerability is now being tracked under, CVE-2021-20019. SonicWall has issued a statement advising they were made “aware, tested and patched a non-critical buffer overflow vulnerability that impacted versions of SonicOS.” Furthermore, SonicWall stated they are not aware of the vulnerability being exploited in the wild. SonicWall has now released advisories related to this vulnerability which includes further information on the fixed versions.(1, 2)
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